As many as you want to create.
There are two syllables. Col-umns.
No, for two reasons. (WHEN the) (PROOFS the) (FIG ures were) (RANGED in) (COL umns be) (FORE you) Count the feet. There are six of them; pentameter has only five. Note what kind of feet. There are four trochees (DUM-ti) and two dactyls (DUM-ti-ti). There are no iambs so it can't be iambic.
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